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Transformers

Transformers
Material used for construction of transformer core is usually

Aluminium
Copper
Silicon steel
Wood

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Transformers
In a certain transformer, the input power to the primary is 120 W. If 8.5 W are lost to the winding resistance, what is the output power to the load, neglecting any other issues?

0 W
1,020 W
14.1 W
111.5 W

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Transformers
How many primary volts must be applied to a transformer with a turns ratio of 0.1 to obtain a secondary voltage of 9 V?

0.9 V
9 V
90 V
900 V

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Transformers
In the short circuit test on a transformer, we generally short circuit ______

Either low or high voltage winding
Low voltage winding
None of the listed here
High voltage winding

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Transformers
The primary and secondary windings are wound on the top of each other in order to reduce ______

Iron losses
Copper losses
Winding resistance
Leakage reactance

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Transformers
Which of the following acts as a protection against high voltage surges due to lightning and switching?

Breather
Conservator
Thermal overload relays
Horn gaps

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